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Thank you for the reply.
So I get that I will need to start again with fresh shrimp but can those shrimp go into the existing tank once all of the old colony have been removed? Is there any chance that the ellobiopsidae could harbour in any of the tank elements such as substrate and filter for example and therefore be introduced to the new shrimp?

Since "ellobiopsidae" aka "green fungus" aka "algae" can show up 3 or 6 months later, or even 2 years later, you either need to treat the entire tank and hope you eliminate it or or restart the tank with fresh blood. (new shrimp that are not from imports)

The reddit person's neighbor may have used high VOC paint which is more deadly. (primer typically has high VOC) Unfortunately without more details, it's hard to say. I've had shrimp die because roommate put a food grade bag into the microwave. It was not microwaveable safe. Three weeks later, neighbors bug bombed their place. Both incidents resulted in a massive die off....
chongkt another option maybe is to get an oxydator that creates oxygen *in* the tank, rather than pulling oxygen from the surrounding area.

First off, you want a substrate that buffers the pH down around 6.5 or below.
Second, the RO water or distilled as recommended. If you have soft water, then a cheap RO machine can work, although the replacement cartridges may be the same amount as a new machine. If you have hard water, then I would recommend a more expensive RO unit.
Third, you'll need GH minerals for shrimp. (no KH)
Make sure you have a liquid test kit that measures all water parameters, including GH and KH. A TDS meter with calibration solution is also recommended.
Sponge filters with an air pump can be used for filtration. It's recommended to get the type that suction to the side of the aquarium.